Number classification is the process of grouping or categorising numbers based on their properties and characteristics. In GCSE Mathematics or high school, numbers are classified into different categories based on their properties: prime, composite, rational, irrational, natural, whole, integers, and real numbers.

Here are some examples of each category of numbers:

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**Prime Numbers:**A prime number is a positive integer greater than 1 that has no positive integer divisors other than 1 and itself. For example, prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, and 37.

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**Composite Numbers:**A composite number is a positive integer with at least one positive divisor other than 1 and itself. For example, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, and 21 are composite numbers.

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**Rational Numbers:**A rational number is a number that can be expressed as a ratio of two integers where the denominator is not zero. For example, 3/4, 5/8, -2/3, and 1 are rational numbers.

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**Irrational Numbers:**An irrational number is a number that cannot be expressed as a ratio of two integers. It is a non-repeating, non-terminating decimal. For example, √2, √3, and π are irrational numbers.

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